Please help I have an hour to complete

The contents of 3838 cans of coke have a mean of x¯¯¯=12.15x¯=12.15. assume the contents of cans of coke have a normal distribution with standard deviation of σ=0.12.σ=0.12. find the value of the test statistic zz for the claim that the population mean is μ=12.μ=12.

Three coins are flipped. what is the probability that there will be at least two tails?

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.